Sakura-chan's Box

Toshio’s childhood friend was Sakura, who to say the least, was a rash girl. Then one day, Sakura and her family moved far away, leaving Toshio all by himself. Sakura left Toshio but one thing - a mysterious box. In Toshio’s grief of having his best friend move away, he forgot about the box until the months flew past. Toshio is now a high school student. One day, while rummaging through his room, he happens upon Sakura’s box, but when he opens it, he soon realizes it was no ordinary box!
Source: Manga.Club